package com.usian.wemmedia.filter;

import com.usian.admin.jwt.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.log4j.Log4j2;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import javax.xml.ws.handler.Handler;

@Component
@Log4j2
public class WmUserFilter implements GlobalFilter,Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1、获取请求和响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2、判断当前是否是登录或注册
           String [] url ={"/in","/register","/login"};
           for (String s : url) {
               if (request.getURI().getPath().contains(s)){
                   return chain.filter(exchange);
               }
           }
        //3、获取请求头中的jwt信息
        HttpHeaders headers = request.getHeaders();
        String token = headers.getFirst("token");
        //判断是否存在token(是否登录)
        if (StringUtils.isBlank(token)){
            String json = "{\"errorMessage\":\"not login\"}";
            return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
        }
        //5、解析令牌,判断令牌是否有效
        Claims claims = AppJwtUtil.getClaimsBody(token);
        int i = AppJwtUtil.verifyToken(claims);
        if (i==0||i==-1){
            //5.1 合法，则向header中重新设置userId
            Integer id = (Integer) claims.get("id");
            log.info("find userid:{} from uri:{}",id,request.getURI());
            HttpHeaders httpHeader = new HttpHeaders();
            httpHeader.set("userId",id+"");
            if (i==0){
                String refreshToken = AppJwtUtil.getToken(id.longValue());
                httpHeader.set("refreshToken",refreshToken);
            }
            //重新设置token到header中
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.addAll(httpHeader);
            }).build();
            exchange.mutate().request(serverHttpRequest).build();
        }else {
            String json = "{\"errorMessage\":\"Invalid token\"}";
            return response.writeWith(Flux.just(response.bufferFactory().wrap(json.getBytes())));
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
